diff --git a/assets/resources/application/en.xml b/assets/resources/application/en.xml
index a854f439c..4760f59c8 100644
--- a/assets/resources/application/en.xml
+++ b/assets/resources/application/en.xml
@@ -859,6 +859,7 @@
 		<node name="pluginNotFound" value="No plugin for '%s'"/>
 		<node name="unknownPluginType" value="Unknown plugin type: %s"/>
 		<node name="fileNotFound" value="File not found: %s"/>
+		<node name="unsupportedEncryptionMethod" value="File %s is encrypted with method that is not supported by FBReader. Some pages are not readable"/>
 		<node name="opfFileNotFound" value="OPF is not found in %s"/>
 		<node name="unsupportedFileFormat" value="File format is not supported for '%s'"/>
 		<node name="errorParsingRtf" value="Rtf parsing error in: %s"/>
diff --git a/jni/NativeFormats/JavaNativeFormatPlugin.cpp b/jni/NativeFormats/JavaNativeFormatPlugin.cpp
index 659c5f108..17bc3d928 100644
--- a/jni/NativeFormats/JavaNativeFormatPlugin.cpp
+++ b/jni/NativeFormats/JavaNativeFormatPlugin.cpp
@@ -131,14 +131,14 @@ JNIEXPORT jint JNICALL Java_org_geometerplus_fbreader_formats_NativeFormatPlugin
 }
 
 extern "C"
-JNIEXPORT jstring JNICALL Java_org_geometerplus_fbreader_formats_NativeFormatPlugin_readEncryptionType(JNIEnv* env, jobject thiz, jobject javaBook) {
+JNIEXPORT jstring JNICALL Java_org_geometerplus_fbreader_formats_NativeFormatPlugin_readEncryptionMethod(JNIEnv* env, jobject thiz, jobject javaBook) {
 	shared_ptr<FormatPlugin> plugin = findCppPlugin(thiz);
 	if (plugin.isNull()) {
-		return AndroidUtil::createJavaString(env, FormatPlugin::EncryptionType::UNKNOWN);
+		return AndroidUtil::createJavaString(env, FormatPlugin::EncryptionMethod::UNSUPPORTED);
 	}
 
 	shared_ptr<Book> book = Book::loadFromJavaBook(env, javaBook);
-	return AndroidUtil::createJavaString(env, plugin->readEncryptionType(*book));
+	return AndroidUtil::createJavaString(env, plugin->readEncryptionMethod(*book));
 }
 
 extern "C"
diff --git a/jni/NativeFormats/fbreader/src/formats/FormatPlugin.cpp b/jni/NativeFormats/fbreader/src/formats/FormatPlugin.cpp
index 1084107ed..b5bababd3 100644
--- a/jni/NativeFormats/fbreader/src/formats/FormatPlugin.cpp
+++ b/jni/NativeFormats/fbreader/src/formats/FormatPlugin.cpp
@@ -28,9 +28,9 @@
 
 #include "../library/Book.h"
 
-const std::string FormatPlugin::EncryptionType::NONE = "none";
-const std::string FormatPlugin::EncryptionType::UNKNOWN = "unknown";
-const std::string FormatPlugin::EncryptionType::MARLIN = "marlin";
+const std::string FormatPlugin::EncryptionMethod::NONE = "none";
+const std::string FormatPlugin::EncryptionMethod::UNSUPPORTED = "unsupported";
+const std::string FormatPlugin::EncryptionMethod::MARLIN = "marlin";
 
 bool FormatPlugin::detectEncodingAndLanguage(Book &book, ZLInputStream &stream, bool force) {
 	std::string language = book.language();
@@ -103,8 +103,8 @@ const std::string &FormatPlugin::tryOpen(const ZLFile&) const {
 	return EMPTY;
 }
 
-const std::string &FormatPlugin::readEncryptionType(Book &book) const {
-	return EncryptionType::NONE;
+const std::string &FormatPlugin::readEncryptionMethod(Book &book) const {
+	return EncryptionMethod::NONE;
 }
 
 shared_ptr<const ZLImage> FormatPlugin::coverImage(const ZLFile &file) const {
diff --git a/jni/NativeFormats/fbreader/src/formats/FormatPlugin.h b/jni/NativeFormats/fbreader/src/formats/FormatPlugin.h
index e0ebb7f40..e15f04219 100644
--- a/jni/NativeFormats/fbreader/src/formats/FormatPlugin.h
+++ b/jni/NativeFormats/fbreader/src/formats/FormatPlugin.h
@@ -47,11 +47,11 @@ public:
 class FormatPlugin {
 
 public:
-	class EncryptionType {
+	class EncryptionMethod {
 
 	public:
 		static const std::string NONE;
-		static const std::string UNKNOWN;
+		static const std::string UNSUPPORTED;
 		static const std::string MARLIN;
 	};
 
@@ -67,7 +67,7 @@ public:
 
 	virtual const std::string &tryOpen(const ZLFile &file) const;
 	virtual bool readMetaInfo(Book &book) const = 0;
-	virtual const std::string &readEncryptionType(Book &book) const;
+	virtual const std::string &readEncryptionMethod(Book &book) const;
 	virtual bool readUids(Book &book) const = 0;
 	virtual bool readLanguageAndEncoding(Book &book) const = 0;
 	virtual bool readModel(BookModel &model) const = 0;
diff --git a/jni/NativeFormats/fbreader/src/formats/oeb/OEBEncryptionReader.cpp b/jni/NativeFormats/fbreader/src/formats/oeb/OEBEncryptionReader.cpp
index 3b4bbe9ea..772289614 100644
--- a/jni/NativeFormats/fbreader/src/formats/oeb/OEBEncryptionReader.cpp
+++ b/jni/NativeFormats/fbreader/src/formats/oeb/OEBEncryptionReader.cpp
@@ -30,17 +30,17 @@ OEBEncryptionReader::OEBEncryptionReader() : myIsMarlin(false) {
 const std::string &OEBEncryptionReader::readEncryptionInfo(const ZLFile &epubFile) {
 	shared_ptr<ZLDir> epubDir = epubFile.directory();
 	if (epubDir.isNull()) {
-		return FormatPlugin::EncryptionType::UNKNOWN;
+		return FormatPlugin::EncryptionMethod::UNSUPPORTED;
 	}
 
 	const ZLFile rightsFile(epubDir->itemPath("META-INF/rights.xml"));
 	if (rightsFile.exists()) {
 		readDocument(rightsFile);
 		return myIsMarlin
-			? FormatPlugin::EncryptionType::MARLIN
-			: FormatPlugin::EncryptionType::UNKNOWN;
+			? FormatPlugin::EncryptionMethod::MARLIN
+			: FormatPlugin::EncryptionMethod::UNSUPPORTED;
 	} else {
-		return FormatPlugin::EncryptionType::NONE;
+		return FormatPlugin::EncryptionMethod::NONE;
 	}
 }
 
diff --git a/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.cpp b/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.cpp
index 39cea990b..96649fa74 100644
--- a/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.cpp
+++ b/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.cpp
@@ -129,7 +129,7 @@ bool OEBPlugin::readMetaInfo(Book &book) const {
 	return OEBMetaInfoReader(book).readMetaInfo(opfFile(file));
 }
 
-const std::string &OEBPlugin::readEncryptionType(Book &book) const {
+const std::string &OEBPlugin::readEncryptionMethod(Book &book) const {
 	return OEBEncryptionReader().readEncryptionInfo(epubFile(book.file()));
 }
 
diff --git a/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.h b/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.h
index 4cb7f738a..6dbd23b67 100644
--- a/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.h
+++ b/jni/NativeFormats/fbreader/src/formats/oeb/OEBPlugin.h
@@ -33,7 +33,7 @@ public:
 	bool providesMetaInfo() const;
 	const std::string supportedFileType() const;
 	bool readMetaInfo(Book &book) const;
-	const std::string &readEncryptionType(Book &book) const;
+	const std::string &readEncryptionMethod(Book &book) const;
 	bool readUids(Book &book) const;
 	bool readLanguageAndEncoding(Book &book) const;
 	bool readModel(BookModel &model) const;
diff --git a/src/org/geometerplus/fbreader/fbreader/FBReaderApp.java b/src/org/geometerplus/fbreader/fbreader/FBReaderApp.java
index 693dee6c8..946982c7e 100644
--- a/src/org/geometerplus/fbreader/fbreader/FBReaderApp.java
+++ b/src/org/geometerplus/fbreader/fbreader/FBReaderApp.java
@@ -34,6 +34,7 @@ import org.geometerplus.zlibrary.text.view.*;
 import org.geometerplus.fbreader.book.*;
 import org.geometerplus.fbreader.bookmodel.*;
 import org.geometerplus.fbreader.fbreader.options.*;
+import org.geometerplus.fbreader.formats.FormatPlugin;
 
 public final class FBReaderApp extends ZLApplication {
 	public final MiscOptions MiscOptions = new MiscOptions();
@@ -278,6 +279,22 @@ public final class FBReaderApp extends ZLApplication {
 
 		getViewWidget().reset();
 		getViewWidget().repaint();
+
+		try {
+			if (!FormatPlugin.EncryptionMethod.NONE.equals(
+				book.getPlugin().readEncryptionMethod(book))) {
+				System.err.println("UNSUPPORTED ALGORITHM");
+				/*
+				UIUtil.showErrorMessage(
+					FBReader.this,
+					"unsupportedEncryptionAlgorithm",
+					myBook.File.getPath()
+				);
+				*/
+			}
+		} catch (BookReadingException e) {
+			// ignore
+		}
 	}
 
 	private List<Bookmark> invisibleBookmarks() {
diff --git a/src/org/geometerplus/fbreader/formats/FormatPlugin.java b/src/org/geometerplus/fbreader/formats/FormatPlugin.java
index edc442f4d..e4e0cf383 100644
--- a/src/org/geometerplus/fbreader/formats/FormatPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/FormatPlugin.java
@@ -28,9 +28,9 @@ import org.geometerplus.fbreader.bookmodel.BookModel;
 import org.geometerplus.fbreader.bookmodel.BookReadingException;
 
 public abstract class FormatPlugin {
-	public interface EncryptionType {
+	public interface EncryptionMethod {
 		String NONE = "none";
-		String UNKNOWN = "unknown";
+		String UNSUPPORTED = "unsupported";
 		String MARLIN = "marlin";
 	}
 
@@ -48,7 +48,7 @@ public abstract class FormatPlugin {
 		return file;
 	}
 	public abstract void readMetaInfo(Book book) throws BookReadingException;
-	public abstract String readEncryptionType(Book book);
+	public abstract String readEncryptionMethod(Book book);
 	public abstract void readUids(Book book) throws BookReadingException;
 	public abstract void readModel(BookModel model) throws BookReadingException;
 	public abstract void detectLanguageAndEncoding(Book book) throws BookReadingException;
diff --git a/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java b/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java
index a8902653c..ea46ee321 100644
--- a/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/NativeFormatPlugin.java
@@ -61,7 +61,7 @@ public class NativeFormatPlugin extends FormatPlugin {
 	private native int readMetaInfoNative(Book book);
 
 	@Override
-	public native String readEncryptionType(Book book);
+	public native String readEncryptionMethod(Book book);
 
 	@Override
 	synchronized public void readUids(Book book) throws BookReadingException {
@@ -83,7 +83,6 @@ public class NativeFormatPlugin extends FormatPlugin {
 	@Override
 	synchronized public void readModel(BookModel model) throws BookReadingException {
 		final int code = readModelNative(model);
-		System.err.println("ENCRYPTION TYPE = " + readEncryptionType(model.Book));
 		if (code != 0) {
 			throw new BookReadingException(
 				"nativeCodeFailure",
diff --git a/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java b/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java
index fb45f3de3..291bcabf1 100644
--- a/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java
+++ b/src/org/geometerplus/fbreader/formats/fb2/FB2Plugin.java
@@ -48,8 +48,8 @@ public class FB2Plugin extends JavaFormatPlugin {
 	}
 
 	@Override
-	public String readEncryptionType(Book book) {
-		return EncryptionType.NONE;
+	public String readEncryptionMethod(Book book) {
+		return EncryptionMethod.NONE;
 	}
 
 	@Override
diff --git a/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java b/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java
index f019d4ada..1c7639f4b 100644
--- a/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/oeb/OEBPlugin.java
@@ -62,8 +62,8 @@ public class OEBPlugin extends JavaFormatPlugin {
 	}
 
 	@Override
-	public String readEncryptionType(Book book) {
-		return EncryptionType.NONE;
+	public String readEncryptionMethod(Book book) {
+		return EncryptionMethod.NONE;
 	}
 
 	@Override
diff --git a/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java b/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java
index db60c3857..964031fc2 100644
--- a/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java
+++ b/src/org/geometerplus/fbreader/formats/pdb/MobipocketPlugin.java
@@ -124,8 +124,8 @@ public class MobipocketPlugin extends JavaFormatPlugin {
 	}
 
 	@Override
-	public String readEncryptionType(Book book) {
-		return EncryptionType.NONE;
+	public String readEncryptionMethod(Book book) {
+		return EncryptionMethod.NONE;
 	}
 
 	@Override