i have a ipad but can not unlock it and the person i receive it from does not have the info to unlock it

Without the Apple ID and Password of the original person who set up the iPad, you will never be able to use it. You have encountered Activation Lock which is an anti theft feature. We cannot help and Apple will not unless you can produce the original receipt clearly showing the serial number. Read the link in blue above your name on this page. You can recycle the device at any Apple Store.