Based on the provided legal document, the key points are as follows:

1. The court distinguished between relinquishment deeds executed solely for one co-owner and those benefiting all co-owners. A relinquishment deed that benefits only one co-owner, without involving all, is classified as a gift rather than a release, which impacts stamp duty liability (!) (!) (!) (!) .

2. The nature of the deed—whether it is a release or a gift—is determined by the actual character and purpose of the transaction, not merely by its nomenclature or language. The transaction's intent and effect are decisive factors (!) (!) (!) (!) (!) (!) (!) .

3. A true release deed involves the relinquishment of rights by a co-owner in favor of all other co-owners, leading to an enlargement of the remaining co-owners' shares. Conversely, executing a deed solely in favor of one co-owner constitutes a gift, not a release (!) (!) (!) (!) (!) (!) .

4. The execution of separate relinquishment deeds by individual co-owners, each in favor of some but not all other co-owners, does not meet the legal criteria for a release as per the relevant legal principles and thus is classified as a transfer or gift (!) (!) (!) .

5. The actual intent behind the deed, the recitals, and covenants are crucial. If the recitals suggest a transfer of interest rather than a relinquishment in favor of all co-owners, the deed is considered a conveyance or gift, affecting stamp duty obligations (!) (!) .

6. The court emphasized that the designation of the document and the language used are not conclusive; the true character is determined by the transaction's substance and purpose (!) (!) (!) (!) .

7. In the specific cases discussed, the relinquishment deeds executed in favor of a single co-owner, or those supporting a transfer rather than a release, were held to be gifts or conveyances and not exempt from higher stamp duty as a release (!) (!) (!) .

8. The orders impounding the deeds for deficient stamp duty were upheld, but penalties imposed without clear reasoning were set aside. The court directed the respondents to proceed with registration and to pay costs accordingly (!) (!) .

9. The court clarified that the execution of deeds that do not satisfy the criteria of a release—such as those favoring only one co-owner or containing recitals of transfer—are chargeable as gifts or conveyances, not as releases (!) (!) .

10. The court also noted that in cases where the deeds are part of a single transaction, even if executed separately, they may collectively constitute a release if they meet the legal criteria; otherwise, they are considered gifts or transfers (!) (!) .

In summary, the court's primary emphasis is on the actual intent, character, and effect of the deed rather than its label or form. Deeds that transfer or relinquish rights only in favor of specific co-owners are classified as gifts or conveyances, impacting stamp duty obligations accordingly.