Using tetris block in game
I'm developing game for iOS. Game is puzzle which consist of blocks which simular to tetris block and user should set it to right place. Blocks dont fall from top. User manipulates it with taps. 

I've met with one problem - some guys said that I must have license for using tetris blocks in my app. Otherwise TTC (Tetric company) suits me and rejects my app from AppStore.

I've googled and not found info about restrictions of using tetris blocks.

I will be very glad if somebody have info or advice for me.
Using tetris block in game
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I'm developing game for iOS. Game is puzzle which consist of blocks which simular to tetris block and user should set it to right place. Blocks dont fall from top. User manipulates it with taps. 

I've met with one problem - some guys said that I must have license for using tetris blocks in my app. Otherwise TTC (Tetric company) suits me and rejects my app from AppStore.

I've googled and not found info about restrictions of using tetris blocks.

I will be very glad if somebody have info or advice for me.