Non-GAAP Net income and EPS. We define non-GAAP net income as net income calculated in accordance with GAAP, plus non-cash stock compensation charges, non-cash patent amortization charges and excess benefit related non-cash tax expense. Non-GAAP EPS is defined as non-GAAP net income divided by the weighted average outstanding shares, on a fully-diluted basis, calculated in accordance with GAAP, for the respective reporting period.

Due to the inherent volatility in stock prices, the use of estimates and assumptions in connection with the valuation and expensing of share-based awards and the variety of award types that companies can issue under FASB ASC Topic 718, management believes that providing a non-GAAP financial measure that excludes non-cash stock compensation allows investors to make meaningful comparisons between our recurring core business operating results and those of other companies, as well as providing our management with a critical tool for financial and operational decision making and for evaluating our own period-to-period recurring core business operating results. Similarly, due to the variability associated with the timing and amount of patent acquisition payments and estimates inherent in the capitalization and amortization of patent acquisition costs, management believes that providing a non-GAAP financial measure that excludes non-cash patent amortization charges allows investors to make meaningful comparisons between our recurring core business operating results and those of other companies, and also provides our management with a useful tool for financial and operational decision making and for evaluating our own period-to-period recurring core business operating results. Lastly, for financial reporting purposes, tax expense is required to be calculated without the excess tax benefit related to the exercise and vesting of equity-based incentive awards, however, the deduction related to the exercise and vesting of equity-based incentive awards is available to offset taxable income on our consolidated tax returns. Accordingly, the non-cash tax expense calculated without the excess benefit for financial statement purposes is credited to additional paid-in capital, not taxes payable, and does not represent a cash tax obligation. Management believes that providing a non-GAAP financial measure that excludes excess benefit related non-cash tax expense allows investors to assess our net results and the economic impact of income taxes based largely on cash tax obligations, make more meaningful comparisons between our recurring core business net results and those of other companies, and also provides our management with a useful tool for financial and operational decision making and for evaluating our own period-to-period recurring core business net results.

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