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I have discovered that one of my competitors built a similar-to-mine website (design, content).
Their design is about 40% similar to mine
They copied the Yahoo's Font Logo (is it valid to use Yahoo's font for creating Logo?)
Content: For each page on their website, they stole: 3-5 sentences on my websites. (The can-be-found-no-where sentences.) The others, they copy from other websites, it means that each website, they stole 3-5 sentences to combine their own.
is it worth to file a DMCA to Google for this copy?
If you see that it's affecting your rankings and traffic, then it might be worth your energy. Otherwise there may be more fruitful ways to spend your time.
Soapystar, you mean, it is still copyright infringement, for example:
"Wikipedia is an free online encyclopedia" or
"There are 40 flights per day from USA to UK on American Airlines"
They are the true-in-any-case sentences.
When Our competitor repeats the above sentences means that they are still violating the CRight?
If they USE other people's stuff - eg excerpts of film reviews etc, with credit, it may well be fair usage.
If it's in between, check with a lawyer if the cease and desist fails.