(3)__Subject to subsection (8), if requested by the account debtor, an assignee shall seasonably furnish reasonable proof that the assignment has been made.__Unless the assignee complies, the account debtor may discharge its obligation by paying the assignor, even if the account debtor has received a notification under subsection (1).

(4)__Except as otherwise provided in subsection (5) and sections 2-1303 and 9-1407, and subject to subsection (8), a term in an agreement between an account debtor and an assignor or in a promissory note is ineffective to the extent that it:

(a)__Prohibits, restricts or requires the consent of the account debtor or person obligated on the promissory note to the assignment or transfer of, or the creation, attachment, perfection or enforcement of a security interest in, the account, chattel paper, payment intangible or promissory note; or

(b)__Provides that the creation, attachment, perfection or enforcement of the security interest may give rise to a default, breach, right of recoupment, claim, defense, termination, right of termination or remedy under the account, chattel paper, payment intangible or promissory note.

(5)__Subsection (4) does not apply to the sale of a payment intangible or promissory note.

(6)__Except as otherwise provided in sections 2-1303 and 9- 1407 and subject to subsections (8) and (9), a rule of law, statute, or regulation that prohibits, restricts or requires the consent of a government, governmental body or official, or account debtor to the assignment or transfer of, or creation of a security interest in, an account or chattel paper is ineffective to the extent that the rule of law, statute or regulation:

(a)__Prohibits, restricts or requires the consent of the government, governmental body or official, or account debtor to the assignment or transfer of, or the creation, attachment, perfection or enforcement of a security interest in the account or chattel paper; or

(b)__Provides that the creation, attachment, perfection or enforcement of the security interest may give rise to a default, breach, right of recoupment, claim, defense,