TL:DR; Secure-USB - a tiny, portable and easy-to-use file encryption software that implements strong 256-bit AES encryption to encrypt data.
Download Secure USB Shareware - Rating: 4.78
HTML password protect, encrypt HTML files with 384 bit keys. Protect web page or entire website with a password. Encryption algorithm used is much stronger than the 128 bit cipher used in todays browsers. Many additional security options.
BARROCO code is 2D bar code and it can handle any binary or text data such as documents, video, text and audio. There is applied compression, encryption, encoding and error correction to create strong redundant dot code.
ttdsoft PDF Copy Protection Tools for Android is to prevent all your pdf files from unauthorized copy and distribution. Once protected (encrypted) using this software , protected PDF can be read from many medias such USB Drive OTG SD Card