![]() Preview can encrypt PDF documents, and restrict their use for example, it is possible to save an encrypted PDF so that a password is required to copy data from the document, or to print it. As of OS X 10.4 ( Tiger), Preview lost playback functionality and animated GIF files are displayed as individual frames in a numbered sequence. The version of Preview included with OS X 10.3 ( Panther) could play animated GIF images, for which an optional button could be added to the toolbar.
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