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2. Smallpdf.com - Wikipedia

   en.wikipedia.org/wiki/Smallpdf.com

   Smallpdf is a Swiss online web-based PDF software, founded in 2013. [2] It offers free version with limited features to compress, convert and edit PDF documents. [ 3 ] And its paid version offers advanced features like OCR, compress, and more [ 4 ] .

3. Watermark - Wikipedia

   en.wikipedia.org/wiki/Watermark

   The Crown CA watermark found on many British Commonwealth stamps (seen from the reverse) A US postal stationery envelope from 1883 showing a clear watermark on laid paper In philately , the watermark is a key feature of a stamp, and often constitutes the difference between a common and a rare stamp.

4. iStock - Wikipedia

   en.wikipedia.org/wiki/IStock

   The company was founded by Bruce Livingstone in May 2000, as iStockphoto, a free stock imagery website supported by Livingstone's web development firm, Evolvs Media. iStock pioneered the crowd-sourced stock industry and became the original source for user-generated stock photos, vectors and illustrations, and video clips. It began charging ...

5. Digital watermarking - Wikipedia

   en.wikipedia.org/wiki/Digital_watermarking

   A digital watermark is called semi-fragile if it resists benign transformations, but fails detection after malignant transformations. Semi-fragile watermarks commonly are used to detect malignant transformations. A digital watermark is called robust if it resists a designated class of transformations. Robust watermarks may be used in copy ...

6. freeImages - Wikipedia

   en.wikipedia.org/wiki/FreeImages

   The stock.xchng website in 2009, with iStockphoto results. The stock.xchng site operated as a hybrid of a picture library site and a social networking site; registered users could set up a personal profile, upload their photographic works to share with other users, write a blog and participate in online forums to discuss and critique each other's work.

7. Digital video fingerprinting - Wikipedia

   en.wikipedia.org/wiki/Digital_video_fingerprinting

   A unique watermark can be added to the content at any stage in the distribution process, and multiple independent watermarks can be inserted into the same video content. This can be particularly useful in tracing the history of a copy of a video. Detecting watermarks in a video can indicate the source of an unauthorized copy.