... if so why companys cann use blockhain for their needs e.g. ibm and other companys shoudnt they pay a commision to have the right to use the blockhain
In addition to above replies - not every blockchain has to be related to Bitcoin. There are hundreds of altcoins with their own blockchains, and there many big players working on developing their own "blockchain technology" to suit their needs.
"Blockchain tech" has lately become a popular buzz word and could mean completely different things.