Encryption Toolkit 2003 Trial Edition 

The Encryption Toolkit includes all the tools you need to add file encryption and data encryption to your applications. The toolkit includes COM encryption objects with a standard interface for both the Pocket PC and Windows® desktop platforms.
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HideInPicture 

HideInPicture enables you to encrypt and hide any type of Files inside of Pictures. This way your files are hidden in plain sight, and in a place that no one would even think to look. You can create complete Web galleries with your hidden files.
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